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Finding the Fourth Proportional to 658.48, 908.56 and 392.85

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Solution

The fourth proportional to 658.48, 908.56 and 392.85 is: 542.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.48 : 908.56 = 392.85 : x
  2. Step 2: Convert to fraction form
    658.48/908.56 = 392.85/x
  3. Step 3: Cross multiply
    658.48x = 908.56 × 392.85
  4. Step 4: Simplify right side
    658.48x = 356,924.54
  5. Step 5: Solve for x
    x = 356,924.54/658.48
  6. Step 6: Final answer
    x = 542.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.